Mirrodin

Mirrodin was the 50th Magic: The Gathering set, the 30th expert level set, and the first set in the Mirrodin Block, released in October 2003. It is a 306-card expansion set. It is also the name of the block containing the Mirrodin, Darksteel and Fifth Dawn expansion sets. This expansion, as well as the rest of the block, is centered around artifacts and is only the second set to do so (from a card frequency point of view) since Antiquities. The percentage of artifact cards is much higher than in any preceding set. Mirrodin 's expansion symbol is a small image of Sword of Kaldra, a card from this set.